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https://issues.apache.org/jira/browse/HIVE-7705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14095077#comment-14095077
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Gopal V commented on HIVE-7705:
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Oh, in case anyone wants to dig into how ThreadLocals are obtained, it doesn't
use the %gs/%fs registers (and therefore aren't comparable to the C/C++
equivalents).
They are really entries stored in a currentThread as a hashmap named
ThreadLocalMap + WeakReferences.
> there's a useless threadlocal in LBUtils that shows up in perf profiles
> -----------------------------------------------------------------------
>
> Key: HIVE-7705
> URL: https://issues.apache.org/jira/browse/HIVE-7705
> Project: Hive
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-7705.patch
>
>
> It might be cheaper to just create a VInt every time, but it can also be
> passed in externally.
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